There is no definition of what an MPU is and why this is a different "community" than the MCU with its sub communities. Please explain. You might put that in the description section of the forum two forums.

[Piranha]

It means "Microprocessor unit", because it has no RAM and flash in it. Usually those are with Cortex-A core(s) not Cortex-M, and often is called also SoC (system on a chip).

[Ozone]

But it interferes with "Memory Protection Unit", which most Cortex M devices have.

Such memory-less devices had historically been called "microprocessor".

Dunno why every vendor feels the urge to invent his own terminology.

Remember, PCMCIA.

[Tesla DeLorean]

The MPU boards are designed to run Embedded Linux properly, so you're building kernels, writing drivers, and apps running on the OS. I suspect they kept the things separate so as not to confuse the chaps using the MCU class devices, and those claiming to "know linux" yet have never built a kernel.

The bigger question was what fool thought calling them STM32 parts would help separate functional differences and expectations.

[Bumsik Kim]

For me it is super obvious. It is not hard to guess what MPU means when the word is used ​alongside with MCU. It's a microprocessor that is capable of running normal Linux. And it definetely need a separate communities because it's....Linux.